Question

收到错误：

CS0029：无法隐式转换类型＆＃39; System.Collections.Generic.List＆＃39;到＆＃39; int＆＃39;

不确定如何解决。

我正在使用：

Microsoft .NET Framework版本：2.0.50727.5477;

ASP.NET版本：2.0.50727.5479

给我带来麻烦的部分是：

{
    debugStr = debugStr + "-a=noattributesadd";
    CartItem item = new CartItem(context);
    item.ProductId = product.ProductId;
    item.Quantity = qty;  
    items.Add(item);
}

具体来说，item.Quantity = qty;部分

完整的代码是：

CartItemCollection items = new CartItemCollection();
Cart cart = Core.GetCartObject();
string skus = "";
string debugStr = "";
Product product = null;
List<int> qty = new List<int>();
foreach (string item in HttpContext.Current.Request.Form.GetValues("quantity_input"))

{
    qty.Add(int.Parse(item));
}

try
{
    string[] productNumbers = HttpContext.Current.Request.Form.GetValues("ProductNumber");
    foreach (string productNumber in productNumbers)
    {
        debugStr = debugStr + "-p=" + productNumber;
        if(!string.IsNullOrEmpty(productNumber.Trim()) && !productNumber.StartsWith("Enter Product #"))
            {
                try
                {   //redirect if no product found 
                    product = Core.GetProductObjectByProductNumber(productNumber);
                }
                catch (Exception e)
                {
                    debugStr = debugStr + "-e=noproductfound";
                    continue; //do nothing, process the next user input
                }
                //check if we have a valid product object, allow virtual and other type(s) for adding directly to cart which may need special handling
                if(product != null)
                    {
                        debugStr = debugStr + "-t=" + product.ProductTypeName;
                        if(!product.ProductTypeName.Equals("NORMAL"))
                        {
                            //assume VIRTUAL (or other type) and redirect for selecting child/group products or other special handling
                            form.Redirect("product.aspx?p=" + product.ProductNumber);
                        }
                        else
                        {
                            debugStr = debugStr + "-a=noattributesadd";
                            CartItem item = new CartItem(context);
                            item.ProductId = product.ProductId;
                            item.Quantity = qty;  
                            items.Add(item);
                        }
                        skus = skus + ";" + productNumber;
                        product = null;  //reset the product object in case the next product number submitted is invalid
                    }  //product not null
            }  //sanity check for empty or default data
    }  //iterate on each product submitted
cart.AddItems(items);
form.Redirect("cart.aspx?skus=" + skus);
}
catch (Exception e)
{
    form.AddError("*** ProductNumber provided was not found ***");
    form.Redirect("quickorder.aspx?qo=2&e=" + e.Message);
    return;
}

基本上，这是快速订单表格的逻辑。我试图将每个项目的数量添加到购物车。

Answer 1

你的问题在于这一行：

 item.Quantity = qty;

item.Quantity是一个int，qty是List<int>

猜测如何解决（假设所有列表的顺序相同，枚举将以相同的顺序读取它们）：

int index = 0; // add this line
foreach (string productNumber in productNumbers)
{

 // all the stuff you have already till:

                        item.Quantity = qty[index];

 // all the stuff you have already

   index = index + 1;
}  //iterate on each product submitted

注意：我讨厌这个解决方案。但它可能会有效。

一个好的解决方案是创建一个数据结构，同时保存产品编号和数量。

无法隐式转换类型＆＃39; System.Collections.Generic.List <int>＆＃39;到＆＃39; int＆＃39; </int>

1 个答案: